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diff --git a/Bachelor/Prog2/Codebeispiele/1_ch09/fig09_22_24/CylinderTest/circle4.cpp b/Bachelor/Prog2/Codebeispiele/1_ch09/fig09_22_24/CylinderTest/circle4.cpp
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+++ b/Bachelor/Prog2/Codebeispiele/1_ch09/fig09_22_24/CylinderTest/circle4.cpp
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+// Fig. 9.20: circle4.cpp
+// Circle4 class member-function definitions.
+#include <iostream>  
+
+using std::cout;
+
+#include "circle4.h"   // Circle4 class definition
+
+// default constructor
+Circle4::Circle4( int xValue, int yValue, double radiusValue )
+   : Point3( xValue, yValue )  // call base-class constructor
+{
+   setRadius( radiusValue );
+
+} // end Circle4 constructor
+
+// set radius 
+void Circle4::setRadius( double radiusValue )
+{
+   radius = ( radiusValue < 0.0 ? 0.0 : radiusValue );
+
+} // end function setRadius
+
+// return radius 
+double Circle4::getRadius() const
+{
+   return radius;
+
+} // end function getRadius
+
+// calculate and return diameter
+double Circle4::getDiameter() const
+{
+   return 2 * getRadius();
+
+} // end function getDiameter
+
+// calculate and return circumference
+double Circle4::getCircumference() const
+{
+   return 3.14159 * getDiameter();
+
+} // end function getCircumference
+
+// calculate and return area
+double Circle4::getArea() const
+{
+   return 3.14159 * getRadius() * getRadius();
+
+} // end function getArea
+
+// output Circle4 object
+void Circle4::print() const
+{
+   cout << "Center = ";
+   Point3::print();      // invoke Point3's print function
+   cout << "; Radius = " << getRadius();
+
+} // end function print
+
+/**************************************************************************
+ * (C) Copyright 1992-2003 by Deitel & Associates, Inc. and Prentice      *
+ * Hall. All Rights Reserved.                                             *
+ *                                                                        *
+ * DISCLAIMER: The authors and publisher of this book have used their     *
+ * best efforts in preparing the book. These efforts include the          *
+ * development, research, and testing of the theories and programs        *
+ * to determine their effectiveness. The authors and publisher make       *
+ * no warranty of any kind, expressed or implied, with regard to these    *
+ * programs or to the documentation contained in these books. The authors *
+ * and publisher shall not be liable in any event for incidental or       *
+ * consequential damages in connection with, or arising out of, the       *
+ * furnishing, performance, or use of these programs.                     *
+ *************************************************************************/
+\ No newline at end of file